Flask quickstart

参照:クイックスタート — flask-docs-ja 0.10-dev documentation

A Minimal Application: OK

Debug Mode

app.debug = True
app.run()

or:

app.run(debug=True)

Routing

@app.route('/')
def index():
    return 'Index Page'

@app.route('/hello')
def hello():
    return 'Hello World'

Variable Rules

@app.route('/user/<username>')
def show_user_profile(username):
    return 'User %s' % username

@app.route('/post/<int:post_id>')
def show_post(post_id):
    return 'Post %d' % post_id

デフォルトでは以下の型の指定が可能

int:整数 float:小数 path:URLパス

URL Building

@app.routeで追加したルートはurl_forでURLを取得することができる。:

>>> from flask import Flask, url_for
>>> app = Flask(__name__)
>>> @app.route('/')
... def index(): pass
...
>>> @app.route('/login')
... def login(): pass
...
>>> @app.route('/user/<username>')
... def profile(username): pass
...
>>> with app.test_request_context():
...  print url_for('index')
...  print url_for('login')
...  print url_for('login', next='/')
...  print url_for('profile', username='John Doe')
...
/
/login
/login?next=/
/user/John%20Doe

HTTP Methods

@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'POST':
        do_the_login()
    else:
        show_the_login_form()

• GET, HEAD, POST, PUT, DELETE, OPTIONS

Static Files

url_for('static', filename='style.css')

Rendering Templates

サンプルはFlaskrでOK

The Request Object

サンプルはFlaskrでOK

File Uploads

form側を enctype=”multipart/form-data”とした上で、 request.files[‘name’]でアクセスすることができる。:

from flask import request
from werkzeug ipmort secure_filename

@app.route('/upload', methods=['GET', 'POST'])
def upload_file():
    if request.method == 'POST':
        f = request.files['the_file']
        f.save('/var/www/uploads/' + secure_filename(f.filename))

Cookies

get:

request.cookies.get('username')

set:

from flask import make_response

@app.route('/')
def index():
    resp = make_response(render_template(...))
    resp.set_cookie('username', 'the username')
    return resp

Redirect and Errors

from flask import abort, redirect, url_for, render_template

@app.route('/')
def index():
    return redirect(url_for('login'))

@app.route('/login')
def login():
    abort(401)
    this_is_never_executed()

@app.errorhandler(404)
def page_not_found(error):
    return render_template('page_not_found.html'), 404

Message Flashing

サンプルはFlaskrでOK

Logging

のちほど

Hooking in WSGI Middlewares

のちほど

Deploying to a Web Server

のちほど